P2BC7Battery Charging System Positive Contactor B Control Circuit/Open
- Generic OBD-II code · Powertrain
- How the car detects it
- P2BC7 concerns the coil drive line of positive charging contactor B, not its main contacts: the module compares its command with the voltage and current it measures on that line and sets the code when the line is broken or the driver that does not follow. No manufacturer documents P2BC7 publicly. GM's test for the twin code of contactor A (P0D0A) on the Chevrolet Volt shows the method: with the driver off, more than 4 V on the output means an open, and with it on, a coil current under 57 mA counts as open too; the code needs 40 bad readings in a window of 50, taken every 12.5 ms. Monitoring of charging hardware on plug-in models is a CARB requirement. Usual causes: broken wire, loose plug, open coil. Range/performance, low and high are P2BC8–P2BCA, the minus side P2BCE. The charging mode behind contactor B is lost.
- What you may notice
- Charging via the contactor B path not possible
- Charging fault indication
- Likely causes
- LikelyControl wire or connector to contactor B interrupted
- PossibleCoil of positive contactor B open
- RareDriver stage in the control module defective
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.